Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df24473678087bd…

MALICIOUS

PDF

83.8 KB Created: 2021-07-05 18:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5331236989cd0c59406bee7888c8c442 SHA-1: c82ea41df59fab589c69b01984d9e136be2eb55f SHA-256: 8df24473678087bde14fda8bd7031b752db1fae8cd93dd9491a73706d2cff3a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or downloads. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/9893a23dd14e1d415d8393f26d2285ff/xexuladazapodikap.pdf In PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4e08ede252d05d6d0184410e319df8a7/ruwunagovuvodaliparedulan.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/xanuxazalimibolibo.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a30fd886ce8---xunesatax.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/10411196503.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/87562263268.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba06b417371---dafonasatujo.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/70b4413829373b52c4fa26795e870b86/75121540447.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/192210178008.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/80470352265.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/4b5d07aa15fb2a47f5063b33678a4e01/63127057431.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/9urf4c9v0igolmgiiil684hse4/xefatibojovoxet.pdfIn PDF document text
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/dbaccba705875a9dc08be331ef6d16ef/feditinategomeduzi.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9964257279---3218780834.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28db8da741---58126513927.pdfIn PDF document text
    • http://apsons.eu/files/file/gunumanufav.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d5b4cac24---92547399880.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/wixebuzalenasirevubi.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/mumovus.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/figosazumakekuzevuf.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/xuwabomoberojiwivuruju.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/88895029846.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c01444962---vimad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+get+credits+warframePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63B 16588 bytes
SHA-256: abbfdd90b93d5061b670031d85d3eae7f0b9f4346000614c9278b3d95c0afa0b
font_01_sfnt_off00011154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11154 10748 bytes
SHA-256: 83962d5020d9ab23a2e2041a6d42296e3765f38fa8f2e367c221a5252ec8e0c8
font_02_sfnt_off000129ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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